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The tomato (Solanum lycopersicum) is a crop that is characterized by considerable nutrient export because of its intensive growth, development, fruiting, and high biomass production. The purpose of this study is to determine how single-dose and split potassium fertilization impact the overall amount of nitrogen, potassium, and phosphorus exported from soils during crop harvest. A field experiment was carried out on Fluvosol (FAO, ISRIC World Soils) with K2O content of 20.3 mg/100g, P2O5 content of 5.8 mg/100g, and mineral N of 19.6 mg/kg. It was found that the biological yield and N, P2О5 and K2O nutrient export are significantly influenced by planting time and potassium fertilization treatments. Higher tomato fruit and biomass yields (61878.9 and 27184.9 kg/ha), along with higher nutrient export rates were observed in mid-early tomato plants. The highest yield and total N, K2O and P2O5 export from the soil was measured at split potassium (К80+80+80) fertilization treatment. A positive linear correlation between yield quantity and nutrient export was observed. The biological yield and nutrient export were shown to be significantly impacted by potassium fertilization (P, Доматът (Solanum lycopersicum) е култура, която се характеризира със значителен износ на хранителни вещества, заради интензивния си растеж, развитие, плододаване и високо производство на биомаса. Целта на настоящата работа е да се определи влиянието на калиево торене – еднократно и дробно върху износа на общ азот, калий и фосфор от почвите с прибиране на реколтата. Изведен е полски експеримент върху алувиалноливадна почва – Fluvosol (FAO, ISRIC World Soils), със съдържание на K2O - 20.3 mg/100g, на P2O5 – 5.8 mg/100g и на минерален N - 19.6 mg/kg. Установено е, че биологичният добив и износът на хранителни вещества са значително повлияни от времето на засаждане и начина на внасяне на калиевата норма. По-висок добив на доматени плодове и биомаса (61878.9 и 27184.9 kg/ha), заедно с по-високи нива на износ на хранителни елементи се наблюдават при средно-ранните домати. Износът на хранителни вещества следва положителна линейна връзка с увеличаването на добива. Найвисок добив и съответно най-висок общ N, K2O и P2O5 са изнесени при трикратно калиево торене (К80+80+80). Установена е значителна корелационна зависимост между начина на внасяне на калиевата норма и износа на хранителни вещества с биологичния добив (P

Annual data provided by worldwide organizations such as the American Psychological Association (APA), the American Institute of Stress (AIS), and the Mental Health Foundation show that education and health professions are under the most stress. Although burnout and stress are usually associated with a more mature age, results from modern studies show that younger generations (18–24) experience a higher level of stress and anxiety than older ones, with the leading cause of this phenomenon being associated with increased expectations and the pressure to exceed them. According to WHO data, suicide is the fourth leading cause of death among 15- to 29-year-olds, with depression being one of the leading diseases in this age group.These alarming statistics draw particular attention to the mental health of medical students, who, in addition to falling into the risky age group, are exposed to a high amount of stress from their chosen professional environment. Given the global shortage of health care workers and high dropout rates among trainees, implementing stress management programs for medical students is becoming an increasingly topical issue.The aim of this study is to investigate the impact of stress on students studying medical specialties and on their quality of life throughout their study period.The results obtained revealed increased stress levels among the respondents. This data proves the negative impact of stress on students' mental and physical health and decreases their quality of life. Such concerning findings undoubtedly highlight the need for increased attention to the problem and the search for alternatives to minimize stress levels among medical students.

In the past, the nursing profession has relied on theories from other disciplines such as medicine, philosophy, and sociology. With the dynamic development of nursing from a practical and research perspective, the inevitability of developing specific conceptual models of care and theories to outline a philosophical framework for the profession arises. Models of nursing care should be studied as part of the theoretical training of future health workers, as they instill basic professional principles, skills, and responsibilities in medical nursing students.All this is then fundamental to the continuing development of nursing and supports the expansion of its autonomous functions. Students of the Medical Nurse specialty play a key role in the continuity and development of nursing, which in turn prompts the study of their opinions on the importance of conceptual models of care in their professional training.The purpose of this study is to collect the opinions of students from the specialty Medical Nurse, trained at the Medical Faculty of Sofia University St. Kliment Ohridski, about the importance of conceptual models of care in their academic and practical education. Future health professionals' interest in and attention to conceptual models in their professional training has decreased. The majority of participants believe that conceptual models are sufficiently studied, yet they do not regard them as the foundations of medical nursing. These alarming results point to weaknesses in the overall structure, assessment, and control of nursing training activities and, accordingly, a decrease in the level of services provided.

This dissertation is a comprehensive and in-depth scientific study of health care in the transplant process in patients with kidney disease and the possibilities for optimizing the nurse's participation in it. Based on a detailed and in-depth review of the literature on the "transplantation process", such as a historical review of the emergence of the concept of kidney transplantation, an analysis of the modern state of the problem of "pre- and post-transplant preparation" and international experience, the main challenges and outstanding problems related to pre- and post-transplant care in nursing practice have been identified and a need to explore possibilities for optimising them. The conclusions of the literary review justify the purpose and tasks of the dissertation work., Дисертационният труд представлява комплексно и задълбочено научно изследване на здравните грижи в трансплантационния процес при пациенти с бъбречни заболявания и възможностите за оптимизиране на участието на медицинската сестра в него. Въз основа на подробен и задълбочен преглед на литературата, касаеща „трансплантационен процес”, като исторически преглед на възникване на концепцията за бъбречна трансплантация, анализ на съвременното състояние на проблема „пред- и посттрансплантационна подготовка” и международния опит са изведени основните предизвикателства и нерешени проблеми, свързани с пред- и посттрансплантационните грижи в сестринската практика и е очертана необходимост от проучване на възможности за оптимизирането им. Изводите от литературния обзор обосновават целта и задачите на дисертационния труд.